Stefan Serbic
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Engineering Quiz on Heat Treatment of Carbon Steels, created by Stefan Serbic on 07/04/2018.

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Stefan Serbic
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Heat Treatment of Carbon Steels

Question 1 of 12

1

The purpose of heat treatment of carbon steel is

Select one of the following:

  • To soften the carbon steel prior to shaping and machining

  • To relieve the residual stresses from strain hardening that occurs during cold
    forming

  • To control dispersion strengthening for achieving the final strength and
    hardness required in the finished product

  • All above

Explanation

Question 2 of 12

1

The microstructure in annealed carbon steel is

Select one of the following:

  • Austenite

  • Pearlite

  • Bainite

  • Martensite

Explanation

Question 3 of 12

1

Cooling down austenite by moderate cooling rate forms

Select one of the following:

  • Cementite

  • Pearlite

  • Bainite

  • Martensite

Explanation

Question 4 of 12

1

Carbon steel tempering should take place

Select one of the following:

  • Prior to quenching

  • After quenching

  • Prior to normalizing

  • After normalizing

Explanation

Question 5 of 12

1

Which of the following microstructures in carbon steel is a two-phased, lamellar (or
layered) structure composed of alternating layers of ferrite (88 wt. %) and cementite
(12 wt. %)?

Select one of the following:

  • Bainite

  • Austenite

  • Martensite

  • Pearlite

Explanation

Question 6 of 12

1

When austenite is cooled down at a very high rate by quenching, its FCC structure
will transform to Body Centred Tetragonal (BCT) known as

Select one of the following:

  • Austenite

  • Bainite

  • Cementite

  • Martensite

Explanation

Question 7 of 12

1

Which of the followings in carbon steel is an extremely hard and brittle phase which
lacks toughness so it should be tempered?

Select one of the following:

  • Austenite

  • Martensite

  • Pearlite

  • Ferrite

Explanation

Question 8 of 12

1

List the hardness in ascending order (from low to high) of micro-constitutes in plain
carbon steel

---

Drag and drop to complete the text.

    Ferrite
    Pearlite
    Bainite
    Martensite

Explanation

Question 9 of 12

1

In the process of carbon steel normalizing, it is cooled down in

Select one of the following:

  • furnace

  • air

  • water

  • Saline water

Explanation

Question 10 of 12

1

In process of carbon steel quenching, which cooling medium has the bubbling
problem?

Select one of the following:

  • Water

  • Oil

  • Salt water

  • All above

Explanation

Question 11 of 12

1

What gas should be selected for quenching the carbon steel in the compressed gas
quenching process?

Select one of the following:

  • O2

  • Cl2

  • H2

  • N2

Explanation

Question 12 of 12

1

Surface hardening heat treatment is also called as

Select one of the following:

  • Annealing

  • Quenching

  • tempering

  • Case hardening

Explanation

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